Astronomers have long been intrigued by the makeup of the asteroid belt’s largest body. When it was first spotted in 1801, ...

Sculpture outside the Reach museum in Richland Bob Brawdy bbrawdy@tricityherald.com Saturn is at the USS Triton Sail in north ... approval for the beloved dwarf planet. All told so far, at least ...

Discovery of 2017OF201, a large trans-Neptune Object, challenges previous beliefs about the Kuiper Belt and hints at the existence of a theoretical Planet Nine.

The small world was found during a search for the hypothetical Planet Nine, and astronomers say the next time it will reach ...

A potential new dwarf planet has been discovered in the outer reaches of the solar system, and its existence poses the ...

Scientists have identified an object about 435 miles (700 km) wide inhabiting the frigid outer reaches of our solar system that might qualify as a dwarf planet, spotting it as it travels on a highly ...

As it orbits the sun once every 25,000 years, the celestial body 2017 OF201 travels beyond the Kuiper Belt into a region ...

A team of astronomers believe they may have discovered a new dwarf planet—just like Pluto—on the edge of our solar system.

Earth has a new neighbor that lives far, far away. Scientists from the Institute for Advanced Study's School of Natural ...

Pluto was reclassified as a dwarf planet in 2006. Our solar system may have a ninth planet after all, researchers say. The possibility that an additional planet may be hidden far into the solar ...

Pluto was officially reclassified from a planet to a dwarf planet by the International Astronomical Union (IAU) in August 2006. While Pluto orbits the Sun and is large enough to be spherical due ...